Tool-post for lathes.



F. C. KEHR.

TOOL POST FOR LATHES.

APPLICATION FILED NOV. 21, 1914.

1,134,460, Patented Apr. 6, 1915.

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as PA TOOL-POST FOB- LATI-IES.

Application filed November 21, 1914.

To all whom it may concern Be it known that I, FREDERICK C. KEHR, a citizen of the United States, residing at Hartford, in the county of Washington and State of l/Visconsin, have invented certain new and useful Improvements in Tool-Posts for Lathes, of which the following is a specification.

This invention relates to tool posts for lathes and other machines employing similar tool holders, and one object of the invention is to provide means whereby creeping of the cutter or tool when inuse will be prevented.

A further object of the invention is to provide simple and efficient means for adjusting the tool to the work, and the invention also seeks to provide a device for the stated purposes which will be simple in its construction, compact in the arrangement of its parts, and efficient in operation.

These several stated objects, and such other incidental objects as will appear as the description of the invention proceeds, are attained in the use of the device illustrated in the accompanying drawings, and the invention resides in certain novel features which will be particularly pointed out in the claims following the description.

In the drawings: Figure 1 is a sectional view of a tool post embodying my improvements, showing the same in operative position, and Fig. 2 is a detail perspective view of the tool rest or saddle.

The reference numeral 1, in the accompanying drawings, indicates the upper portion of the slide-rest of a lathe or other machine on which the tool-post is mounted, the tool-post 2 being equipped near its lower end with an annular groove adapted to engage the overhanging lips or flanges 3 on the said rest, as clearly shown in Fig. 1. The tool-post is provided with a vertical slot 4, through which the cutter or other tool 5 is inserted, and in the upper end of the post I mount a clamping screw 6 which is adapted to bear upon the upper side of the tool to secure the same in position, as will be readily understood.

A tool rest 7 is employed, and this rest consists of a preferably circular block having a central opening 8 to fit around the tool post, and also provided upon its upper side at its edge with an upstanding projection shown as an annular rib 9 which is adapted to engage a notch or one of a series of notches Specification of Letters Patent.

Patented Apr. 6, 1915.

Serial No. 873,381.

10 in. the underside of the tool. The tool rest is also provided with a radial groove 11 having its base or lower wall inclined downwardly from the outer edge of the rest to the inner central opening of the same, as clearly shown, the groove extending through the annular rib 9, as will be readily understood upon reference to the drawings.

A wedge-shaped key 12 is fitted in this radial groove or seat 11, and the said key is adapted to extend into the slot 4 in the post 2', as shown in Fig. 1. The wedge is so disposed that its oblique face will engage the lower inclined wall or base of the groove 11, while its upper face will occupy a horizontal plane and form a support for the tool, as clearly shown in Fig. 1. The key is preferably provided at its smaller outer end with a depending flange or handle 13 whereby it may be easily manipulated.

The use and advantages of my improved device are thought to be evident from the foregoing description taken in connection with the accompanying drawings.

The cutter is passed through the slot 4 in the post with one of the notches 10 fitting over the rib 9 on the tool rest. The key 12 is adjusted longitudinally so as to raise or lower the cutter and thereby bring the cutting point 14: to the proper height for the desired work. When this adjustment has been effected, the screw 6 is turned home against the cutter so as to clamp the same securely against the rest and the key, whereupon the cutter will be firmly secured in place. It will be readily noted that the engagement of the rib 9 with the notch in the underside of the tool effectually prevents the tool moving longitudinally through the post or upon the rest and, consequently, the

creeping which now frequently occurs will be positively prevented. At the same time, the cutter is supported in a firm manner so that it will not tend to rock while in use and the desired adjustment of the cutter can be very quickly effected.

It will be noted that I have illustrated two notches of different depths in the drawing. By providing a plurality of notches of different depths to engage the rib on the saddle, the range of adjustment is increased.

Having thus described the invention, what is claimed as new is:

1. The combination of a tool post, a tool rest fitted around the post, a tool inserted through the post and bearing directly on the rest, interengaging means on the tool rest and the tool to prevent movement of the tool through the post, and means for clamping the tool to the rest.

2. The combination with a tool post, of a tool rest fitted around the post and provided with a seat in its upper face at one side and a fixed projection at the opposite side,a tool bearing on the rest and extending over said seat and engaging' said projection, a supporting member adjustable vertically in said seat and engaging theunder side of the tool whereby to support it in a horizontal plane in any vertically adjusted position, and means acting upon the tool to clamp it against said supporting member.

3. The combination with a tool post, of a tool rest fitted around said post and having a radial groove in its upper side, said groove having a downwardly and inwardly inclined base, a Wedge disposed in said groove and having its upper face disposed in a horizontal plane, a tool inserted through the post extending over the tool rest and bearing, upon the same and said wedge, interengaging means onthe tool and the rest to prevent longitudinal movementof the tool, and means for clamping the tool to the wedge and" the tool rest."

4:. The combination of a tool post having a vertical slot therein, a tool rest'fitted on said post and provided with a downwardly and inwardly inclined groove in its upper face and having a rib projecting upwardly from said face, a tool inserted through the sl'oti-nthe post and extending over the said groove and provided in its underside with a notch adapted to engage said rib, a wedge fitted in said'groove andbearing against the underside of the tool, and means carried by the post for clamping the tool to the said wedge and to the tool rest.

In testimony whereof I afiiX my signature in presence of two witnesses.

FRED; C. KEHR. [n s.]'

Witnesses: V

' J SOHNORENBERG,

HERMAN G; BERNETT;

copies 0! this patent may be obtained m five cents each, by addressing the Commissioner of Patents:

. Washington, D. 0. 

